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operating system services are made via the Win32 API and C run-time libraries. When SQL Server runs under Windows NT/2000, it runs entirely in the Win32 protected subsystem. Absolutely no calls are made in Windows NT/2000 Privileged Mode; they are made in User Mode. This means that SQL Server cannot crash the entire system, it cannot crash another process running in User Mode, and other such processes cannot crash SQL Server. SQL Server has no device driver_level calls, nor does it use any undocumented calls to Windows NT/2000. If the entire system crashes (giving you the so-called Blue Screen of Death ) and SQL Server happens to have been running there, one thing is certain: SQL Server did not crash the system. Such a crash must be the result of faulty or incompatible hardware, a buggy device driver operating in Privileged Mode, or a critical bug in the Windows NT/2000 operating system code (which is doubtful).
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TIP: The Blue Screen of Death a blue bug check screen with some diagnostic information appears if a crash of Windows NT/2000 occurs. It looks similar to the screen that appears when Windows NT/2000 initially boots up.
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A key design goal of both SQL Server and Windows NT/2000 is scalability. The same binary executable files that run on notebook computers run equally well on symmetric multiprocessor superservers with loads of processors. SQL Server includes versions for Intel and RISC hardware architectures on the same CD-ROM. Windows NT/2000 is an ideal platform for a database server because it provides a fully protected, secure, 32-bit environment. The foundations of a great database server platform are preemptive scheduling, virtual paged memory management, symmetric multiprocessing, and asynchronous I/O. Windows NT/2000 provides these, and SQL Server uses them fully. The SQL Server engine runs as a single process on Windows NT/2000. Within that process are multiple threads of execution. Windows NT/2000 schedules each thread to the next processor available to run one.
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SQL Server approaches multiprocessor scalability differently from most other symmetric multiprocessing (SMP) database systems. Two characteristics separate this approach from other implementations:
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Single-Process Architecture SQL Server maintains a single-process, multithreaded architecture that reduces system overhead and memory use. This is called the Symmetric Server Architecture. Native Thread-Level Multiprocessing SQL Server supports multiprocessing at the thread level rather than at the process level, which allows for preemptive operation and dynamic load balancing across multiple CPUs. Using multiple threads is significantly more efficient than using multiple processes.
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To understand how SQL Server works, it is useful to compare its strategies to those generally used by other products. On a nonthreaded operating system such as some UNIX variants, a typical SMP database server has multiple DBMS processes, each bound to a specific CPU. Some implementations even have one process per user, which results in a high memory cost. These processes communicate using shared memory, which maintains the cache, locks, task queues, and user context information. The DBMS must include complex logic that takes on the role of an operating system: It schedules user tasks, simulates threads, coordinates multiple processes, and so on. Because processes are bound to specific CPUs, dynamic load balancing can be difficult or impossible. For the sake of portability, products often take this approach even when they run on an operating system that offers native threading services, such as Windows NT/2000. SQL Server, on the other hand, uses a clean design of a single process and multiple operating system threads. The threads are scheduled onto a CPU by a User Mode Scheduler. SQL Server always uses multiple threads, even on a singleprocessor system. Threads are created and destroyed depending on system activity, so thread count is not constant. Typically, the number of active threads in SQL Server ranges from 16 to 100,
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